Permatex The Right Stuff Grey Gasket Maker 10.1 oz — Sensor-Safe, High-Temp Fast-Cure

Permatex The Right Stuff Grey Gasket Maker is a high-temperature, sensor-safe RTV sealant that forms a flexible, blowout-resistant gasket in minutes for engine and transmission applications.

This professional-grade tube is formulated to handle engines with closely spaced bolt patterns and higher torque loads—common in many import vehicles—so you can create custom gaskets that resist oil, coolant and ATF. It cures to an elastic rubber that outperforms many precut gaskets, sets quickly so assemblies can be put back into service fast, and tolerates continuous heat up to 450°F (232°C) and intermittent spikes to 500°F (260°C).

How quickly will this gasket maker cure so I can reassemble parts?

The Right Stuff Grey forms a leakproof gasket that becomes service-ready fast; it’s blowout resistant and allows many repairs to be reassembled in about one minute depending on bead thickness and ambient conditions. Full cure strength develops over time, but initial sealing is immediate for most applications.

• Initial set: typically within one minute for bead layup
• Reassembly: most repairs can be put into service quickly
• Full cure: varies with temperature, humidity, and bead size

Will it withstand fluids and high under-hood temperatures?

Yes—this formula resists common powertrain fluids and retains elasticity under prolonged heat exposure. It’s engineered to remain stable against oil, coolant and automatic transmission fluid while operating continuously at elevated temperatures.

• Fluid resistance: ATF, motor oil and engine coolant
• Temperature endurance: continuous to 450°F (232°C)
• Intermittent spikes: tolerates up to 500°F (260°C)

Is it safe to use around engine sensors and electronics?

The Right Stuff Grey is specified as sensor-safe, meaning cured material is compatible with many sensors and won’t interfere with typical sensor operation when used as directed. Use recommended application practices to avoid contact with sensor faces or electrical connectors during installation.

• Sensor-safe once cured when applied per instructions
• Avoid applying directly onto sensor elements or exposed electronics
• Clean mating surfaces for best adhesion and sensor compatibility

What parts can I realistically seal with this product?

This gasket maker is versatile for many automotive sealing jobs where custom, durable gaskets are needed. It’s commonly used for oil pans, valve covers, transmission pans and water pumps, as well as thermostat housings and other machined flanges with closely spaced bolts.

• Valve covers and oil pans
• Transmission pans and thermostat housings
• Water pumps and irregular or precut-gasket replacements

Who is this for: Mechanics, DIY enthusiasts and restoration shops that work on modern engines—especially those with tight bolt patterns—will benefit from Permatex The Right Stuff Grey. It’s ideal when you need a durable, fluid-resistant, high-temperature gasket that sets quickly, withstands higher torque loads, and produces a reliable elastomeric seal where precut gaskets don’t fit or perform.